Final answer:
The sentences have been rephrased to reflect the audience's viewpoint.
Step-by-step explanation:
a) The engine might have been impacted when you used a lower-grade oil than the recommended 4000 grade oil.
b) With several certifications on computer networking and wireless communication, as well as extensive experience in this area, I believe I am the most suitable candidate for the Network Specialist post.
c) In order to process your order, I require a specific color.
d) None of these.